MIDDLE ALBIAN STRATIGRAPHY 



At the point marked X on the sketch-map (text-fig. 34) a vertical section normally 

 buried within the dune sands showed a sequence from the Argiles d'Ostrea Leymerii 

 (Upper Aptian) up into the lower part of the Lower Gault 1 . Price (1879, Io> 8o ; 34) 



Bed 



1 3 



12 



10 

 9 



L i t h ol og y 



Blackish phosphotic nodules, mainly cost 3 ot fossils \ 

 preserved, in shelly grey clay. 



ith portions ot the shell 



(v) Burrowed grey clay, the burrows having pale infill inqs. 



(Iv) Very dark grey clay with a few scattered part-phosphatised fossils 

 with the nacreous shell preserved. A line of scattered phosphatic 

 nodules occurs 2 inches from the base. 



(lll)Part phosphatlsed fossils in extensively burrowed clay. 



(il)Grey burrowed shelly clay. 



(i)Dark grey shelly clay. 



Black angular phosphatic nodules in grey clay. 



Darkish grey clay with scattered shells, and with a scattered 

 line of phosphatic nodules buff in colour. 



Grey shelly clay. 



(II) Sparsely shelly well-bedded dark grey clay. 



(i) Glauconitic blocky dark grey clay, wl.th a thin bedded Junction 

 with 8(H) above, and becoming progressively more 

 glauconitic downwards. 



Large brown grey phosphatic nodules with abraded upper surfaces, some compound, 

 with smaller black phosphotic nodulesond fragments of fossils, m glauconitic loa 



1! 



j*~r_- .'.* 



fcuP^&SSfe 



Ft Ins M 



- 2-4 



5- 



3- 



2- 



6 

 2 - 



Fig. 35. Section in Lower Gault in the sea-cliff extending from point X on the sketch map 

 (Fig. 34) up to the old german block-house 0.4 km SW. of Strouanne, Wissant, Pas de 

 Calais. 



had stated that at Wissant the ' Ammonites-mammillaris Zone and the A .-interruptus 

 zone (Bed I) are mixed together, so much so that it is difficult to divide them ; but the 



fossils from the former have the greensand matrix '. Now, in Bed 7 in the section 



mentioned above, a magnificent fauna of puzosianus Subzone age was collected by 

 the writer preserved in exactly the manner described by Price and associated with a 

 spathi Subzone fauna. The large puzosianus Subzone nodules had obviously stood 



1 It appears to be the first time this century that this section has been seen. It was described by Gaudry 

 (i860). Le Hon (1864 ; 14-16), and Barrois (1879). The section examined by Dutertre, in company 

 with Kirkaldy (1938 ; 121-2), was situated in the cliffs near the farm of Saint P6. I can confirm the 

 accuracy of Barrois' section from a point about 4 ft. (1-21 m.) below the top of the Argiles d'Ostrea 

 Leymerii up to the top of the Sables Vert. 



